Improvement in automatic gates



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p TO ALL WHOM- IT MAYCON CERN Be it known that I, SYLVESTER J., WRIGHT,of Ellsworth, inthe county of St. Lawrence, and State of New York, haveinvented a new and useful Improvement in Self-Opening Gate; and I dohereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in Vthe art to'make and use the same, reference being had to the accompanyingdrawings, forming part of this specification, in which- Figure 1 is avertical longitudinal section of my improved gate taken through the linex 9;, fig. 2.

Figure 2 is a vertical cross-section of the same taken through the linez e, iig. l.

Figure 3 is a vertical cross-section of the same taken through the liney y, lig. l.

Similar letters of reference indicate like parts.

vMy invention has for its object to furnish an improved gate soconstructed and arranged as to be opened by the weight of. theadvancingman, horse, or team, and to close itself as soon asv the cause of itsopening has passed through; and it consists in the combination of therollers, flexible straps, springs, lever-arms, and cords or chains, witheach other, with the stationary frame, movable platform and gates, andin the combination of the coiled wire springs, or their equivalent, withthe gate, the whole being constructed and arranged as hereinafter morefully described.

A is a box set in the ground. The box A should be vof such` a depth asto allow the necessary play to the rollers, C, and their attachments,and of such a length tllat the man, horse, or teamL by the weight ofwhich the gate is opened, may have space to enter upon the platform B tooperate the gate and yet be outof the way of the swing of said gate, Care rollers, the ends ofl which are pivoted to the ends of the box A, asshown in iig. l. To the sidesof the rollers C, at their ends, areattached the ends of leather or other flexible straps, D, the other endsof' which are attached to the lower ends of the downwardly-projectingarms Z2 of thel platform B, so that as the said platform is forced downthe straps I) may revolve the rollers O in such a direction as to causethe lever-arms E, attached to said rollers, to swing inward. F is a ropeor chain, one of the ends of which is attached to the end of the arm E,and which passes thence over the guidapulleys G, and its other end isattached to the gate H, so that as the rollers C are revolved by thedepression of the platform B, the gate will be swung open and held sountil the platform is again raised. I are flexible straps, one of theends of which is attached to the sides of the rollers C, and the otherends of which are attached to the frame of the platform B, so that asthe platform B is released from the depressing weight and rises, therollers C ymay be revolved back te their former position. J arespringssecured to the box A at one or both ends of said box, in such aposition that it may be depressed by forcing the platform I3` downward,so that ii, by its elasticity may raise the platform B, as soon as thedownward pressure is removed, to its former position, and hold it thereuntil again depressed to again open the gate. K are stops placed in the.lower part of the box A, to receive and sustain the weight of theplatform B and whatsoever weight may be upon it, as soon as the saidplatform has been forced down a sullicient distance to open the gate. Lare coiled wire springs which are coiled around the pivoting bar of thegate H, one end oi' said springs being attached to the said gate, andthe other end to the frame of the box A, or to the gate-post M.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The combination of the rollers C, flexible straps D and I, spring orsprings J, lever-arm E, and rope or Achain F, with each other, with thestationary frame or box A, movable frame or platform B, and gate H,substantially as herein shown and described, and for the purposes setforth.

` 2. The combination of the coiled wire pring L, or equivalent, with thegate H, substantially as and for the purpose herein set forth. 4 l

SYLVESTER J. WRIGHT.

Witnesses:

M. D. PACKARD, H. P. BULLIs.

